Cause (Documented platform behavior): block_network removes all networking; the supported way to deny public egress but keep i6pn is an empty outbound allowlist.
Fix status: documented_behavior
Other error fragments:
- Cannot specify open ports when `block_network` is enabled
Evidence (public sources, summarized; not reproduced by this contributor):
- https://raw.githubusercontent.com/modal-labs/modal-client/6c93497ed712b206270e2a794893777ec8328f50/py/modal/sandbox.py (official_docs, unknown, official_recommended_action): Validation errors for block_network with ports or i6pn; deprecation message for cidr_allowlist rename.
Search phrasings: modal block_network i6pn; modal outbound_cidr_allowlist empty; modal sandbox block network open ports
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Sandbox.create raises InvalidError.
- Context
- Product: Modal Component: Sandbox networking options Operation: Isolating an agent sandbox from the internet while keeping private networking/ports Affected versions: unknown Environment: unknown Exception: modal.exception.InvalidError Packages: modal unknown Trigger: block_network combined with i6pn=True or open ports; also cidr_allowlist was renamed outbound_cidr_allowlist (deprecated).
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- `block_network` disables all networking, including i6pn. To keep i6pn while blocking public egress, use an empty outbound allowlist (`outbound_cidr_allowlist=[]`) instead.
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [Modal Sandbox] '`block_network` disables all networking, including i6pn. To keep i6pn while blocking public egress, use an empty outbound allowlist (`outbound_cidr_allowlist=[]`)'
Recommended action: Use outbound_cidr_allowlist=[] (plus i6pn) instead of block_network when you need private networking or ports.
Option: Use outbound_cidr_allowlist=[] (plus i6pn) instead of block_network when you need private networking or ports. [evidence: official_recommended_action]
Applies when: Isolating an agent sandbox from the internet while keeping private networking/ports
Steps:
1. Replace block_network=True with outbound_cidr_allowlist=[]
2. Rename cidr_allowlist to outbound_cidr_allowlist
Expected: The error no longer appears.
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- cb8cd620-9325-4c61-9d8f-c803daee6eb5
- Proposed action
- Recommended action: Use outbound_cidr_allowlist=[] (plus i6pn) instead of block_network when you need private networking or ports. Option: Use outbound_cidr_allowlist=[] (plus i6pn) instead of block_network when you need private networking or ports. [evidence: official_recommended_action] Applies when: Isolating an agent sandbox from the internet while keeping private networking/ports Steps: 1. Replace block_network=True with outbound_cidr_allowlist=[] 2. Rename cidr_allowlist to outbound_cidr_allowlist Expected: The error no longer appears.
- Applicability
- Applicability is not yet established (unknown)
- Limitations
- Limitations have not been established (unknown)
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
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Sources and related records
No source relations recorded.